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A146861 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 19, 37, 77, 131, 515, 1575, 6459, 26455, 139873, 647697, 4036849, 21133021, 162531941, 1088442077 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.1.1.0.0

.0.0.1.1.1.0.0.0

.1.0.0.0.1.0.1.1

.1.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.1

.1.1.0.1.0.0.0.1

.0.0.0.1.1.1.0.0

.0.0.1.1.0.1.0.0

CROSSREFS

Sequence in context: A031093 A297750 A285226 * A068963 A257929 A254060

Adjacent sequences:  A146858 A146859 A146860 * A146862 A146863 A146864

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 12 12:34 EDT 2021. Contains 343823 sequences. (Running on oeis4.)